This is HPI's Nitro Star K4.6 .28 size Engine With Pullstart. This is the standard engine for the Savage SS .28 monster truck kit. FEATURES: Composite construction slide valve, 3 needle carb with hand adjustable high speed needle (the stock carb settings are made flush for convenient "back to factory settings") 8 port chrome plated brass sleeve True ABC cylinder construction Purple anodized machined aluminum heat sink head Rear exhaust round port Cast aluminum crankcase features heatsink fins Machined pilot shaft crankshaft with collet preinstalled Knife-edge billet aluminum connecting rod with dual bushings. Dual stage air filter dramatically reduces intake restriction as it smoothes and straightens air flow INCLUDES: Nitro Star .28 (4.6) glow engine Glow Plug - HPI R5 cold plug (HPIG1504 for a replacement) Dual Stage Air Filter (HPIC7198 for replacement) Instructions and parts break down